The refiners produce asphalt as a byproduct from the manufacture of gasoline and other fuels, Consequently, it is mot surprising that asphalt production does not drive the refinery business.

• 精炼厂商生产的沥青是石油和其他能源提炼产生的副产品，然而，令人惊讶的是沥青产品并未推动精炼业的发展。